STUNNING VINTAGE Rogers Cadet III integrated TUBE valve amp Pro Tech Serviced

Description

STUNNING VINTAGE Rogers Cadet III integrated TUBE valve amp Pro Tech Serviced
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NOTES FROM THE TECH
Work done:
Tested the seven tubes (three in the control unit/preamp, four in the power amp); all are good and likely original (3X Brimar ECC807 in the control unit; 4X Mullard ECL86 in the power section). Slight imbalances can be compensated for using the balance control (only if picky).
Repositioned input voltage selector from 110 to 120 volts.
This unit is newer than I expected (no wax capacitors). I did check the integrity of the filter capacitors; all are okay. I did not replace any components as everything here appears original (“unmolested”) and functional. Such good condition is uncommon and may be of some value to a buyer.
Repaired a broken ground connection for the phono (“disc”) jack input connectors. This fault would have caused excessive hum when using that function.
Sanded oxidation from interconnection cable and cartridge-matching component pins.
Cleaned all controls and switches.
Removed dust and dirt as best as possible.
Cleaned external surfaces, knobs, and cord.
Fastened power amp chassis to the cabinet (the three screws were missing). New screw thread pitch probably isn’t exact, but is close enough to hold and prevent the power amp from unexpectedly dropping out.
One of the screws holding the input jack assembly to the side of the cabinet apparently isn’t original (too long) and protruded through the cabinet when tightened. Because these are European screws (presumably metric, if not some other outdated standard), I didn’t have a shorter one to substitute, so I put a spacer under the head. (It’s possible that someone previously mixed up this screw with another one on the chassis; I didn’t check the length of all of the other screws.) I covered the hole with a woodgrain decal.
Operated the unit for several hours using both the phono (“disc”) and radio inputs. The latter may be used for a modern device such as a CD or MP3 player (or turntable with its own preamp: see below)
Notes:
This amplifier is rated at only 10 watts RMS per channel, so doesn’t go as loud as one might presume, especially with relatively inefficient loudspeakers. See the article referenced in this URL:
https://www.hifinews.com/
content/rogers-cadet-iii-
vintage
. Also take a look at the bottom entry here:
https://www.diyaudio.
com/forums/tubes-valves/91351-
rogers-cadet-iii-phono-stage.
html
about “hiss and hum.”
There is a phono cartridge matching network inside the cylindrical metal can on the side of the control unit/preamp chassis. According to the article referenced above, six different types were originally offered.
"
The GOLD adapter is the Magnetic Cartridge Adapter.
The SILVER adapter is the Ceramic Cartridge Adapter
"
https://www.diyaudio.com/
forums/tubes-valves/28284-
rogers-cadet-iii-pu-adapter.
html
Your unit has a silver (bare aluminum) adapter, which means it's wired for a ceramic (or crystal) cartridge, not a magnetic type. This information would be very pertinent to a potential buyer. (And, yes, the adapter can be re-engineered for a magnetic cartridge using the information provided at the URL above.)
Most quality turntables of yesteryear employed a magnetic cartridge (cheaper units, such as those often found in compact stereos, used the much higher-output crystal or ceramic cartridge, which tracked at a higher force and didn’t reproduce as wide a frequency range). As records faded from popularity in the 1980s, manufacturers began eliminating the magnetic phono amplifier stage from their offerings, so better turntables from that period to the present often contain their own magnetic phono preamps, which can then be connected to one of the so-called line-level inputs (such as the “CD,” “TUNER,” “MP3,” or “AUX” jacks) on an amplifier or receiver. Here, the tuner inputs correspond to the “RADIO” switch on the front panel. (“TAPE” would work as well, although this European unit uses a German “DIN” connector, which was very common in European gear in the 1960s and 1970s, for this. Adapter cords are available to convert this type of input to RCA jacks.) You could use that type of turntable (with built-in preamp) into this amplifier's "DISC" jacks.
Unlike with most American and Asian amplifiers, the balance control on this model does not totally silence the opposite channel when turned to either extremity. Its operation is more subtle.
Literature:
https://
www.valve-
radio.co.uk/literature/rogers-
rd-cadet-mk-3-stereo-
amplifier-circuit-diagram-and-
operating-manual/
. This is the combined unit, found at the end of these pages.
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